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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3585f43db0f8625e0d3fc28c24a480d89759db0363b7a68b4a243af24a0a3b6c' 
  AND token = '8AtCcWOohhNwRURG6tq9pj4DwYmfIDQApnRKV4sYGmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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