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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e530b17b375ea421df2f1aa2f44c2dd0abc43e84dc8a3d07b1e46c4e0e9a89b' 
  AND token = 'PHDAorwFdktH/lq6JFUWmldegsP6sWTRIzS13WkMYso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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