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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3dd793bee542b62fca40244a81f7eaa6c56ad56cbc41ad328782de3aedced98' 
  AND token = 'mGuB4NG8HJJxLW2Y/FxAgiyZzoCsn6Kwycd/iOjOFx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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