SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d68999df79d566223330877699c8eac51fde65963cb584f09039af0f01d158' 
  AND token = 'icgZ+XuXGN/sHzIIh0Zcag+SV2CaQVI0usC7uKmnwcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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