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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c68d71dbf32c0515115da4294877b4ad537e330deb0a8fa50f110490c38f7b' 
  AND token = '8FhujfZh6gc2QuHSZeTJCUoF9UxVdVDhojgR8J6UAIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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