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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ef7f359296a10b9b38c4d146ef2da329f663df0f69d9d4f5f502ec147d02a2' 
  AND token = '2dMcv26+DL2ZIeTu8jDllC1foJU162m5ZmAZeZ+HaFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}