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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dbaa9d8ea13daa140b7dec4a15b8608cc53a64a393c7be43d6270bca51a5bf' 
  AND token = '8THAC7R8ajJjBLpbOwXVfifaJQLOVRnRGopKGiWWMAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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