SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8632892e269b07500ab0c1536d36380e3be619ed895724dd33b3f810920175' 
  AND token = 'pBUygjehxp4/MO+2J6TlPzv0Yts5qDDl9zVGi/skYdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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