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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522fabdb8413698c79f2c789ce21fb00f5ee9a24a5879fb859a7ffe1cbb4fa96' 
  AND token = '7e+WFR5iRmUi8lvKJepNL3jjyZ4EYr2cmtNubUWiztc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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