Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7ee73279bd006722df2663f9021884f3f231b635f2e0f1abc27b4ef7da05e2' 
  AND token = 'e/nJh61WGVy6CQfo79Nve/Rbeq3VBHYUCIX31/83xyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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