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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3405a9080af44c9a572aa46f6b0bef729620d10460588f53fe24193d96c83aa' 
  AND token = 'ymWM5pd+IUOkOhLvyEIX4PGCf/miTHX0Id6g4P+71ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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