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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c97c34fb9775069036ec9e61daabf7223cfecc6240ceab6d1ce27303ab04f7' 
  AND token = 'YC9cI/SBtf8++pGmV8Ju/0717C39HDw0XJKz8PabURs=' 
  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"
    }
  }
}