Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0e15ae800e5cc1ddebefd0c02d903238aaa93c88a92e75c1778087ef4b1f90' 
  AND token = 'd9RFDjH2AHpNeDyHs5DkfJwQelfWziDQrE7nDslteLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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