Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066807595eaeaa6c0e31f39a6b08ecbcd6bc67ab64d181a32d1e7b762a52773e' 
  AND token = 'F/2rCi6SUgNRjQqqP4+yohPrdS+7A591Bi2xHqoSgqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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