Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9bb77b083c516ca177b907ff65f74b319f4e43b94759d96e105c8038777a1d' 
  AND token = 'fkQbkLppm9VtxH299ki6uUsRtCk2KN6zlEWarjDYLho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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