SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd43d61e0335dac5587a20f82f0c0c19d9a6fb03314d7ffcaf2b7710d919d1a9' 
  AND token = 'B6kSKfUM7xoG/wJg/Bq65do9mrZIJApjbVoQM40hYhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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