Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1918d548977178124c203c1203f42944d89d5be6d387857b813abb3ebe55f491' 
  AND token = '7QBKcNrkzE8gyTQIyeH9Vh+OoeKZUWT7nZ/bG2EqZP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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