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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbe47835426c047ba76b3e83b902d5395f629b636914181616d457836e4401d' 
  AND token = 'elakF70w7V4Lt5XzVkEa/TdVs8wbV4DaoLB1fgdF5dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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