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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1922b7113c25332becf04950e9a0e78f87c7b3cc1af979d088888635feb913df' 
  AND token = 'kSD/Md9PeZX9xUz8qeSulX4aih2wkxWGHVTqiUsZDUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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