Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b90acb0fa8e24c181a2ac94c7d09bc9d5a547e8edef13358c53ac673114de1' 
  AND token = '8lPMSebVocewqQ0s48bb5RVqE2nSia9VTuBR+xgS3+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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