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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39db7249e8cce894b8e6e4fb4f18831cbde32e9e0d07dc7a6e92912c0204f432' 
  AND token = '/M6A7KXQ+7gBfENnGZsg2GQr9ndH5jUmJSBoLtR5X8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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