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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a813b4885f29df829be48aa3918cedf556704018952a43317be99ecc780c0b9' 
  AND token = 'P8Scwor/K4ngSIq69GHwrSkAzjfXI3J6YGknHvdwGaI=' 
  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"
    }
  }
}