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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8081c3867fba58e27965fecf0ad0c3a89239b107e8f3798fa48edd5db1c36ee' 
  AND token = 'u3EKVyZV11fiQRX9L7DsA4oEZDMCX9MFdtcs3RPQyfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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