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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36e82a6468b3eb215b8e84c54058ad5daac4d8701b341b7f6290431a4c8d247' 
  AND token = 'FBrPvFyNNGKUsNKOi8lT6kZ+V+mcP6qrNgoBoAT7MSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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