Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e961956e1baac755767e639607e7aa2d5e8e4a2d37d9cc53e662c99a6d6603c5' 
  AND token = 'ffjHLejhONAhqcMPLkmDiZeyODj5gPEduR6+0g2EsLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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