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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d09b8ae6e07db4e5b9069b5a1bc88fa542ad3c1bbe37632d36befa3d03f8cd7' 
  AND token = '3VXwCwVvEWIpuVnLWfq1gEakLoMi3e2J52VAAN9QTkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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