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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0585e449a21e3b96554cd8c845ef48877516f31cbffb17d453e1024291d8a42f' 
  AND token = 'a1x7FFBgXTdTYVscT5lnG6tan3mCfxgQuyZZdmo3E2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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