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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e5cb6e5564caee2b7bb98065ebed92d411edc09b7ebbd8a05d459ab63e9460' 
  AND token = 'zF6mGrhz5WWIjwPvULkApSI51DXpHBI/4z88VKmHJMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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