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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd7082ae9f379084ccaa86c16485a18360d5a0260ffa28f55a339f9c9c7639c' 
  AND token = 'whGQLvGCvLd/FE+jVf/t3dcjjHXgtmT6OpFTPVXjooE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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