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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e467eae37a8645e7307ff3a05f72eed7e0dfdbb5e18dcf5438e586a52242e7' 
  AND token = 'x4LTl6HgCSteymYs8srR/m8BcA9NwfH6ZJhNgRmqNuw=' 
  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"
    }
  }
}