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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b0e9f0d467a4d1ff0950b7b2689fd49d13f1b8cf1a135b4fda61c4b097acf8' 
  AND token = 'paybySjD2HnI8Bb/SfXuI9w8QiEF9ylJwGpKP7Rxo9M=' 
  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"
    }
  }
}