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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3c53f0c0feb8fd07f4e97d4321ad8a33dda2f359795792db57c03043f181e3' 
  AND token = 'Vppg8EDqRPq0k+nRoOGyYM7s5/zP6Qk2RnpSphFLl20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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