Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff4bccb5537f4df51e2c98eaf826cf99ce276a44aa4d00219b410f53d6bb987' 
  AND token = 'KNE6Du4ES+OXNhUvoo5QzeQdYFdzN0LaJQ5GJ8s23Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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