SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0488a7ff7d7f31bf6088f66f0127f7355b2c129cd6b333bdda477e479fb89004' 
  AND token = 'KGZZ35YP/28DTnmNg6sIN1jtOAdlArMBD3RsU5qwtgo=' 
  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"
    }
  }
}