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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700f20181a7b0e262563a3274858ebcb9134a607df319e1ae8791a90e0f70db0' 
  AND token = '9UxIE0vTOYuSkX1G+1ceK7Fv5odLz2gUDyR5cL+YuJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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