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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6217c3885f45df27e5d9d759185dbda7632c5ecfa7e61f062ae5ff672d9f8fbb' 
  AND token = 'XJmSPG3ZiXNXeyLyH467tk3KoKFVtR5CfHYOU7o3vpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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