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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adff1bc1921ee3033b56cb62618cf60ab176511d98790441a0e5df0f3ec21cd1' 
  AND token = '7i9svXi66rs5bc8FtGfG4a0olnD68p5FlHPTgW4KitU=' 
  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"
    }
  }
}