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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff8ea733de75deaa47e8467127f40312a76b7122c1262ad99c8d46d8c24310f' 
  AND token = 'MU7QF4unE5rXGeM4v4Wf+155fcDb5Oy+A8xQ5us93FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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