SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2375a8891ed56f4675c49593fc2c4348f4b4987f4179bf175b42e804bdb94c' 
  AND token = 'QzlYvT8lKaZU+wxyH8OASNqbxQikQcvNGHIDhBfVPnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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