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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9db86b0367465be54e9d8b3b565667679fdc87334b5a74c0201507f5ddacd65' 
  AND token = '/XWtdM/NfXxOIbiU04OADbSyVIYRo/46eX0IpsGD6v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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