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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a06e8b543c2a176d22a54c7705e4762c1562efb002f2bbb982b9614e8ab003' 
  AND token = 'bKEMz+h4IXuVBWi9cg3xbX7qsIbTpZ8Ofl4DJIJ18q4=' 
  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"
    }
  }
}