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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7104d9f29a856d99fdb02b8da06c4bb1f7be433751a9b12a15a2a5162842556f' 
  AND token = 'gQKlNZfe4vJA3PkfTvV1i3l/7enk9SttnW0TgdzkST8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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