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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795f6b74d3fe92eaa513f90f83ad77f23efaf34a59cc84510a6f5f910486585d' 
  AND token = 'jWjTcIIZ4Lxd035yFLAwiUGJ+wQNRUFzNil00MLPFAE=' 
  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"
    }
  }
}