Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee635a7c6e072b2412d6b2852e10394c57ddc4c3bb24027f0ba62b0c59a9930' 
  AND token = 'EsPmg5n4QB90TjEHCELMHInP90NCpomSRiRjBr2XGUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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