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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3960b980171fd7791ef773988936af501e25d71afae1ca2d98c4f424d09805' 
  AND token = 'JJolaZFMnAOLHfXHOJ1ZnXIhxI5IE4mwPkRq6Azl6go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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