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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae3cbd54eaac3bf5e08726ceb973fc938bd8f87069ae01b90fc96633a2cdffd' 
  AND token = 'Xz900ZFj5o9kEL7fPHwsNgr8751Q21nGzovWZYEUfmE=' 
  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"
    }
  }
}