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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eedbee4eedddb67c24b8eda19234f7f8dc2492150bbb1c190b763c94aa7325a' 
  AND token = 'WCVIQWvZ5ttdS6SncG/bgklAnkZRFjsQY9NLs/itp5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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