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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf4de7b564b9a182e3f854a3054335fb6593528423ee283fa501e4c5798c3fd' 
  AND token = 'zsXkz9ZZphp9yS8HaWYH5VVL63qJsGj9TL5m0e7eZ9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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