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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a246190a5be26e312be44cd0658c032e60e3637c78002ac07c46081085a26cd2' 
  AND token = 'VLx+E1Pvi3Bzvx9CAdrmrf8o5/RULpewJ73WlwqJ0Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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