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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79ee2d4486b25a152079242bc0e407e42ac214a0fe56900a3d8c14954f788e8' 
  AND token = 'tm2yIBZquVSorEhEmzfOljzIW/oIyyM9KgelQ2OHzfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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