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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd73f2fc1c3d44ebed51e4265df0a9a4b6b9eebca6a98598b63be96630753a6d' 
  AND token = 'ONSpo2nzrObaW2MkjmoPVAISc044UyH0vco/DuD4h5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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