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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427078b79583ab818aa40b0ab7b7083c2608c6de60e4e626dd36694756664b02' 
  AND token = '6gn62JAoThut/lcJ1q3UCItHUTCHCTW0Bod24ugAGAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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