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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e418a99ba21e354744a8040c9ca9b35d7196efbc76dd7f0bbbfe107f4dab7efc' 
  AND token = '/93QO19Daz/j7Y+zkyH1T+wp8lpHEqOKCb9AxGrQ2OY=' 
  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"
    }
  }
}