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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3b476a6ea26b46d9415f334c8038cd9cfd57ceb3e15359aa8299ee7e0717db' 
  AND token = 'p11AtN2LXnpz6Y+IttX38czgOXcghab8J5GkcYwXUtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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