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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c527db8d1d325b9592a2461cb38800fba42675fdf8c848516f6b49e1b5d635e6' 
  AND token = 'Gdx59QcO8PEeaM29s4Sf9NzgtQ5bKJC0amXObOcLZhk=' 
  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"
    }
  }
}