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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de08043927d453ce2f1b63a8301e7264cff956c172285f73e7a0141b6e2e790' 
  AND token = 'SvMZp0iE6qep+arP/lINGo3KKozRuNuf93zpSX62P9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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