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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0786960f34427df6b1eef12873c3947bdd3fb2f5ee7368fb34f76d816b5495' 
  AND token = 'Cqk7KXailfRHiRzrVM79xcIS5Bj4R+IIIjj6s4h6Ubo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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