Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b703639173657d60d0fe52188652a8d926cbc4de8272694734e1ed2f6ffa71' 
  AND token = 'JcZoWdbIurWKDi78DdkBEu2qVtGRWMM14stGS14I9bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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