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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0998e9e247f0e217e3974d7705e578c6cdeab50b90c7bb4e58e33b717f5bb38f' 
  AND token = 'MSD9n5P6SX0YXpXy1qL8G6R8kxkEPPznXnD4WuJORc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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