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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7b810ff4ef17d2b8c752f96191a1ab9b5acce36455dec6c2256df134efd754' 
  AND token = 'mqjybMrcpP5jBg3flWs7Z4YUr5cTJpOt6PaDN5K3JMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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