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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a244e2562e86d24cec27e2acceca0e65a6590bbd7e20f07dc474d356bb054f' 
  AND token = 'opMiHjFIs7qnGa8mw9DkrGgxjtn38G/dRtW7ajO1mzA=' 
  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"
    }
  }
}