Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730a82d1472a6bdfed064783ff7e4ab1b027efe272b0eedb81b7ab41df8d372c' 
  AND token = '4Z5PUVKScnfACKSm2elmgOwjOYx+W6HEPHlS6n33ziY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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