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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf722c71f4fa1ee6dd0ee5890900e50d734407d38b065b9c3a437c1f76a466dc' 
  AND token = 'PPQcvK9QLqU7AEz2MPeXzss450XRnT5esGS5wIMQ9R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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