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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da21d1ce1e2730fbc7077271d39c65ff4fe8d728206e4ad5f8ac7fa439371ed' 
  AND token = 'HuV5+mdIr842D3XtbHpz2wM1R/wYSb97Ood+5vJM+2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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