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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f412df918aca246c33a21b9401fec13b306298b2cef754e339542e765efa87' 
  AND token = 'PSlENt5mZ7r0jhiUyPkwhM9XKql0SYHx5c4r9tjkWmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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