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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff716b1e123bd7ada3acca79160c771d2139ee0e160cc890ba07fdadfc2d09a' 
  AND token = '/Fy3u6XStmEDovaf75ojXs5QMg0RkgQWjPHfzc6CSBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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