Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56b877f67f7ec2b6428e7b122393fa0729b7a0cc173f78f4f02a270e0f0937b' 
  AND token = 'tUE70RDCpOhtLSnPEtbqSWZEElFaSxMgxoUbkMml+t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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