Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ecc4da0452be3297083ce87f38af9628fe3b37e2a790d9fc30917103f429fe8' 
  AND token = '+Wg1ipLVQqgDbMZlBcG2L015pdYxHp3oN3HTY15I/c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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