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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e179c7e6c43cfaa703c6e9f0e6f68bfafb6c609a8e44feff2183c0ac0cf879' 
  AND token = 'uJHItZXT2qURe2webon6p3MA5iTYc4JqFXl6aGQxjBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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