SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d1bc7b7d99089338914ed6f8c56c57d347af5dd431cdc43452801f57e36584' 
  AND token = 'FfyZPkE4F4rvhzURh2jogFZiu5YmpUfKmHVFzdXbME4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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