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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd563c1c7d282ac872b9ac4087ad8071218b03ee95140c2daeefbb97bc3dc574c' 
  AND token = 'eHUlOXo6FpTMcdCMyYEFZ74dTKs/OQvS+DR5mRDL39E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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