SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ddaef39cde33fcb803f9c2625945fb8b721597e83f952dde30337e3e2b1866' 
  AND token = 'CnJeYHAmyWLEVLgZ0CbwYOjVLumHtPIUJhvnajkCjv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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